diff --git a/src/Composer/Util/AuthHelper.php b/src/Composer/Util/AuthHelper.php
index 4accba716..72b23ba22 100644
--- a/src/Composer/Util/AuthHelper.php
+++ b/src/Composer/Util/AuthHelper.php
@@ -45,7 +45,7 @@ class AuthHelper
                     }
                     throw new \RuntimeException('Please answer (y)es or (n)o');
                 },
-                false,
+                null,
                 'y'
             );